Compound-lever valve-spring lifter



. 1,614,301 Jan 11 1927' w. F. HoBBs coMPouND LEVER vALvusPRIN LINER AFiled sept. 24, 1926 Patented Jan. 11, 1927.

UNITED STATES PATENT OFFICE.

WILLIS F. HOBBS, OF BRIDGEORT, CGNNECTC'UT, ASSIGNOR TO THE BRIDGEPORTHARDWARE MANUFACTURING CORPORATON, OF BRIDGEFORT, CONNECTICUT, A

CORPORATION OF CONNECTICUT.

COIVIYOUND-LEVER VALVE-SPRING LIFTER.

Application led September 24, 1926. SeralNo. 137,456.

This invention relates to a valve lifting tool for lifting the springsof valves of 1nternal combustion engines to assistin removing the valve,and has for an object to pro- 6 vide a tool of this character which isvery simple in construction and so may be mann.- Jactured and sold atlow cost, and which will be simple and easy to operate. i v

l/Vit-hthe foregoing and other Vobjects in lo view, T have devised theconstruction illustrated in the accompanying drawing torming a part ofthis specitication. 'Tn this drawing, j v

Fig. 1 is a top plan View of the device with a portion of the upper mainlever member broken away to more clearly show the construction. i

Fig. 2 is a side elevation ot the device with one of the jaws shown insection, and

Fig. 3 is a vertical section substantially yon line 3-3 of Fig. 2.

My improved valve lifter comprises a pair ot opposed main lever members5 each carrying a forked jaw 6 adapted to embrace the valve stem, andthey are also preferably grooved transversely, as shown at 7', so as notto easily slip from engagement with the end of a spring or its abutment.The lever members 5 are preferably made ot fairly heavy sheet metal bentto substantially U- shape in cross section as shown, and they arepivoted at 8 to a cross bar 9 forming a support. This cross bar is alsopreferably of U-shape in cross section, and the sides are spacedsulificiently to receive the ends of the levers 5 between them asindicated. By making the levers and the cross bar of this crosssectional shape I am able to secure great strength and sti'liqness inproportion to the amount of metal used.

My improved operating device for swinging the jaws to compress thespring includes a pair ot' bell crank levers 10, each lever having twoarms 11 and 12 extending at an pivoted together at the junction ot'these arms, a-s indicated at 13. The arms 11 extend between the sides ofthe lever members 5 and are pivoted respectively to these members asindicated at 14. The other arms 12 of the bell crank levers are pivotedat 15 to links 16, one to each link, and these links are both pivoted attheir opposite ends, as shown at 17, to a screw 18 which extends throughangle to each other, and the two levers areV an opening in the cross bar9 and intermediate the two lever members 5. At the outer side ot thecross bar is an adjusting nut 19 threaded on this screw and abuttingagainst the outer surface of the cross bar. This nut may be of anysuitable lform, but is preferably a wing nut, as shown, so that it maybe operated by the thumb and fingers.

The bell crank levers 10 are so shaped that when the jaws 6 are togetherthe arms 12 are substantially in a straight line and eX- tend inopposite directions from the pivot 13. In operation these jaws areplaced bef tween the ends of the spring and its abutment, and then byturning the nut 19 the screw 18 is drawn outwardly, or to the right, asviewed in Figs. 1 and 2.` This movement will, ot course, draw the arms12 of the bell crankY levers downwardly to the right, as viewed in thesefigures, and will separate the arms 11, and as these latter arms arepivoted to the lever members 5 it will be apparent that these leverswill be swung in o posite directions about their pivots 8 and w11lseparate the jaws to compress the spring. It will be obvious that, asthe arms 12 of the bell crank extend in opposite directions away fromthe pivot 18 and in substantially a straight line, the pull of the links16 on these arms is substantially at right angles to the line joiningthe centers of the pivots 8 and 15, and therefore, these links pull onthese arms with the maximum leverage. Therefore, the screw is veryeasily operated as it has a large leverage on the operating levers,which, of course, is increased as the pivots 14 trom the other arms ofthe bell cranks to the lever members 5 are a considerable distance fromthe pivots 8 for these lever members to the cross bar 9. This device is,theretore, easy to operate and, of course, from the constructionrequires no means for locking the jaws in adjusted position as the screwconstruction will securely hold them in any position to which they areadjusted.

Having thus set forth the nature of my invention, what I claim is:

1. In a valve lifting tool, a pair of opposed members having jaws, across bar to which the members are pivoted, a pair of bell crank leverspivoted together intermediate their` lengths and each having an armpivoted to one of said members, links pivoted to the other arms, a screwhaving pivotal connection with the links and extending through the crossbar, and a nut on the screw for adjusting it.

2. In a valve lifting tool, a. pair of opposed members having jaws, across bar to which the members are pivoted, a pair of levers each havingarms extending at an angle to each other and one of the arms of eachpivoted to said members, a aivot connecting said levers at the junctionetween the arms, a screw connected to the other arms of the levers andextending through the cross bar, and an adjusting' nut on the screw.

3. In a valve lifting tool, a pair of opposed members having jaws, across bar to which the members are pivoted, a pair of bell crank leverspivoted together and each having an arm pivoted to one of said members,a screw connected to the other arms ot the levers and extending throughsaid cross b r, and an adjusting nut on the screw on the outer side ofthe bar.

l. In a valve lifting tool, a pair of members substantially U-shape incross section carrying jaws, a cross bar to which said members arepivoted with their open sides opposed, a pair oft levers pivotedtogether intermediate their lengths and each having one end extendingbetween the sides of one of said members and pivoted thereto-` a screwconnected to the other arms of the levers and extending t-hrough thecross bar, and an adjusting nut on said screw.

5. In a valve lifting tool, a pair 'of members substantially U-shape incross section carrying jaws, a cross bar to which said members arepivoted with their open sides opposed, a pair of bell crank leversbetween said members each having arms extending at an angle to eachother, said levers being pivoted together adjacent the junction ot' saidarms, one arm of each lever extending between the sides of one of saidmembers and pivoted thereto, links pivoted to the other arms of thelevers, a screw pivoted to the links and extending through the crossbar, and an adjusting nut on said screw.

6. In a valve lifting tool, a pair of lever members carrying jaws, asupportto which the lever members are pivoted, a pair of bell cranklevers between the lever members and pivoted together, one arm of eachbell crank being pivoted respectively to the lever mem bers at adistance from their pivots to the support, and meansfor swinging thebell cranks about their common pivot to operate the lever members.

In testimony whereof I atlix my signature.

WILLIS F. HOBBS.

